{"id":3469,"date":"2026-04-30T01:27:14","date_gmt":"2026-04-30T01:27:14","guid":{"rendered":"https:\/\/multahost.com\/blog\/?p=3469"},"modified":"2026-04-30T04:03:51","modified_gmt":"2026-04-30T04:03:51","slug":"vos3000-did-ddi-numbers-complete","status":"publish","type":"post","link":"https:\/\/multahost.com\/blog\/vos3000-did-ddi-numbers-complete\/","title":{"rendered":"VOS3000 DID DDI Numbers Complete Direct Inward Dialing Best Configuration"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\" id=\"vos-3000-did-ddi-numbers-complete-direct-inward-dialing-configuration\">VOS3000 DID DDI Numbers: Complete Direct Inward Dialing Configuration<\/h1>\n\n\n\n<p>\ud83d\udcde How does your VOS3000 softswitch map an external PSTN phone number to an internal VoIP extension? When a customer dials your published business number from the public telephone network, how does VOS3000 know which internal phone should ring? The answer lies in <strong>VOS3000 DID DDI numbers<\/strong> \u2014 the Direct Inward Dialing (DID) and Direct Dialing Inward (DDI) configuration that bridges the gap between public telephone numbers and private extension routing. \ud83c\udfaf<\/p>\n\n\n\n<p>\ud83d\udccb According to the official VOS3000 V2.1.9.07 Manual, Section 2.5.2 (Phone Management), DID\/DDI is defined as follows: &#8220;after the phone on line, the other numbers allowed as caller ID or callee number.&#8221; The manual also provides a critical distinction: &#8220;Number only as signaling transfer, not as billing and reporting datas.&#8221; This means DID\/DDI numbers serve exclusively as signaling identifiers for call routing \u2014 they do not appear in billing records or reporting data as the primary phone number. \ud83d\udee1\ufe0f<\/p>\n\n\n\n<p>\ud83d\udd27 All data in this guide is sourced exclusively from the official VOS3000 V2.1.9.07 Manual, Section 2.5.2 \u2014 no fabricated values, no guesswork. For expert assistance with your VOS3000 deployment, contact us on WhatsApp at <strong>+8801911119966<\/strong>. \ud83d\udca1<\/p>\n\n\n\n<div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><h2>Table of Contents<\/h2><nav><ul><li><a href=\"#vos-3000-did-ddi-numbers-complete-direct-inward-dialing-configuration\">VOS3000 DID DDI Numbers: Complete Direct Inward Dialing Configuration<\/a><ul><li><a href=\"#\ud83d\udd10-what-are-vos-3000-did-ddi-numbers\">\ud83d\udd10 What Are VOS3000 DID DDI Numbers?<\/a><ul><li><a href=\"#\ud83c\udfaf-why-vos-3000-did-ddi-numbers-matter\">\ud83c\udfaf Why VOS3000 DID DDI Numbers Matter<\/a><\/li><\/ul><\/li><li><a href=\"#\u2699\ufe0f-how-did-ddi-works-in-vos-3000\">\u2699\ufe0f How DID\/DDI Works in VOS3000<\/a><\/li><li><a href=\"#\ud83d\udccb-did-ddi-configuration-in-phone-management\">\ud83d\udccb VOS3000 DID DDI Numbers Configuration in Phone Management<\/a><\/li><li><a href=\"#\ud83d\udcca-vos-3000-did-ddi-use-case-scenarios\">\ud83d\udcca VOS3000 DID DDI Numbers \u2014 Use Case Scenarios<\/a><\/li><li><a href=\"#\ud83d\udd17-did-ddi-and-caller-id-presentation\">\ud83d\udd17 DID\/DDI and Caller ID Presentation<\/a><\/li><li><a href=\"#\ud83d\udee1\ufe0f-common-did-ddi-problems-and-solutions\">\ud83d\udee1\ufe0f Common DID\/DDI Problems and Solutions<\/a><ul><li><a href=\"#\u274c-problem-1-inbound-pstn-calls-not-reaching-phone-extension\">\u274c Problem 1: Inbound PSTN Calls Not Reaching Phone Extension<\/a><\/li><li><a href=\"#\u274c-problem-2-did-number-appears-in-cdr-instead-of-extension-number\">\u274c Problem 2: DID Number Appears in CDR Instead of Extension Number<\/a><\/li><li><a href=\"#\u274c-problem-3-wrong-caller-id-displayed-on-outbound-calls\">\u274c Problem 3: Wrong Caller ID Displayed on Outbound Calls<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udcca-vos-3000-did-ddi-configuration-checklist\">\ud83d\udcca VOS3000 DID\/DDI Configuration Checklist<\/a><\/li><li><a href=\"#\u2753-frequently-asked-questions\">\u2753 Frequently Asked Questions<\/a><ul><li><a href=\"#\u2753-what-are-vos-3000-did-ddi-numbers\">\u2753 What are VOS3000 DID DDI numbers?<\/a><\/li><li><a href=\"#\u2753-what-is-the-difference-between-did-and-ddi\">\u2753 What is the difference between DID and DDI?<\/a><\/li><li><a href=\"#\u2753-can-i-assign-multiple-did-ddi-numbers-to-a-single-phone\">\u2753 Can I assign multiple DID\/DDI numbers to a single phone?<\/a><\/li><li><a href=\"#\u2753-do-did-ddi-numbers-appear-in-billing-records\">\u2753 Do DID\/DDI numbers appear in billing records?<\/a><\/li><li><a href=\"#\u2753-does-the-phone-need-to-be-online-for-did-ddi-to-work\">\u2753 Does the phone need to be online for DID\/DDI to work?<\/a><\/li><li><a href=\"#\u2753-how-do-did-ddi-numbers-differ-from-the-phones-primary-extension-number\">\u2753 How do DID\/DDI numbers differ from the phone&#8217;s primary extension number?<\/a><\/li><\/ul><\/li><li><a href=\"#\ud83d\udcde-need-call-center-setup-support\">\ud83d\udcde Need Professional VOS3000 Setup Support?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udd10-what-are-vos-3000-did-ddi-numbers\">\ud83d\udd10 What Are VOS3000 DID DDI Numbers?<\/h2>\n\n\n\n<p>\u23f1\ufe0f <strong>VOS3000 DID DDI numbers<\/strong> are additional external telephone numbers that are mapped to a phone extension in VOS3000. DID stands for Direct Inward Dialing, and DDI stands for Direct Dialing Inward \u2014 both terms refer to the same concept: allowing external callers to dial a specific internal extension directly without going through an operator or auto-attendant. \ud83d\udccb<\/p>\n\n\n\n<p>\ud83d\udccc According to the official VOS3000 V2.1.9.07 Manual, Section 2.5.2:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th class=\"has-text-align-left\" data-align=\"left\">Attribute<\/th><th class=\"has-text-align-left\" data-align=\"left\">Value<\/th><\/tr><tr><td>\ud83d\udccc Setting Name<\/td><td>DID\/DDI<\/td><\/tr><tr><td>\ud83d\udcdd Manual Description<\/td><td>After the phone on line, the other numbers allowed as caller ID or callee number<\/td><\/tr><tr><td>\u26a0\ufe0f Billing Note<\/td><td>Number only as signaling transfer, not as billing and reporting datas<\/td><\/tr><tr><td>\ud83d\udccd Location<\/td><td>Phone Management \u2192 Phone settings<\/td><\/tr><tr><td>\ud83c\udfaf Scope<\/td><td>Per-phone configuration; multiple DID\/DDI numbers per phone<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\ud83d\udca1 <strong>Key insight:<\/strong> The VOS3000 manual explicitly states that DID\/DDI numbers are used &#8220;only as signaling transfer.&#8221; This is a crucial distinction \u2014 it means the DID\/DDI number is used for call setup and routing in the SIP signaling, but the phone&#8217;s primary extension number is what appears in billing records, CDRs, and reporting data. The DID\/DDI number is essentially an alias that the phone can answer when called from the PSTN, but it does not replace the phone&#8217;s primary number for billing purposes. \ud83d\udd12<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\ud83c\udfaf-why-vos-3000-did-ddi-numbers-matter\">\ud83c\udfaf Why VOS3000 DID DDI Numbers Matter<\/h3>\n\n\n\n<p>\u26a0\ufe0f Without properly configured DID\/DDI numbers, several critical business scenarios become impossible:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udcde <strong>PSTN-to-VoIP reachability:<\/strong> External callers from the public telephone network cannot reach specific internal extensions without DID\/DDI mapping \u2014 they would need to go through a receptionist or IVR menu<\/li>\n\n\n\n<li>\ud83c\udfe2 <strong>Business phone identity:<\/strong> Companies that publish specific phone numbers (e.g., department numbers, direct lines) need those PSTN numbers to ring through to the correct VoIP extension<\/li>\n\n\n\n<li>\ud83d\udcca <strong>Professional call routing:<\/strong> Without DID, all inbound PSTN calls arrive at a single point, requiring manual transfer to the correct extension \u2014 inefficient and unprofessional<\/li>\n\n\n\n<li>\ud83d\udd04 <strong>Number portability:<\/strong> When businesses port existing PSTN numbers to a VoIP system, those numbers must be configured as DID\/DDI on the corresponding extensions<\/li>\n\n\n\n<li>\ud83d\udee1\ufe0f <strong>Caller ID presentation:<\/strong> DID\/DDI numbers can serve as the caller ID when the phone makes outbound calls, presenting the external PSTN number to the called party instead of the internal extension<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\u2699\ufe0f-how-did-ddi-works-in-vos-3000\">\u2699\ufe0f How DID\/DDI Works in VOS3000<\/h2>\n\n\n\n<p>\ud83d\udd04 The <strong>VOS3000 DID DDI numbers<\/strong> configuration works by associating one or more external telephone numbers with a phone extension. When an inbound call arrives from the PSTN targeting one of these DID\/DDI numbers, VOS3000 routes the call to the corresponding phone extension. The phone can also use the DID\/DDI number as its caller ID when making outbound calls. \ud83d\udce1<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\ud83d\udcde VOS3000 DID\/DDI Call Flow \u2014 Inbound PSTN Call:\n\nExternal Caller (PSTN)\n    \u2502\n    \u251c\u2500\u2500 \ud83d\udce1 Dials DID Number: +1-555-0199\n    \u2502\n    \u251c\u2500\u2500 \ud83d\udd00 PSTN Gateway receives call\n    \u2502   \u2514\u2500\u2500 SIP INVITE with Request-URI: sip:15550199@vos3000\n    \u2502\n    \u251c\u2500\u2500 \ud83d\udd0d VOS3000 looks up DID\/DDI assignment\n    \u2502   \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n    \u2502   \u2502  Phone Extension: 2001                         \u2502\n    \u2502   \u2502  DID\/DDI Numbers: +1-555-0199, +1-555-0200   \u2502\n    \u2502   \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n    \u2502\n    \u251c\u2500\u2500 \u2705 DID +1-555-0199 matches Phone Extension 2001\n    \u2502\n    \u2514\u2500\u2500 \ud83d\udcde Ring Phone Extension 2001\n        \u2514\u2500\u2500 Call established \u2014 signaling uses DID number\n        \u2514\u2500\u2500 CDR records extension 2001 (NOT DID number)\n<\/pre>\n\n\n\n<p>\ud83d\udcca <strong>Critical distinction:<\/strong> The VOS3000 manual states &#8220;Number only as signaling transfer, not as billing and reporting datas.&#8221; This means that in the CDR, the phone&#8217;s extension number (e.g., 2001) is recorded for billing and reporting, not the DID\/DDI number (e.g., +1-555-0199). The DID\/DDI number is used during call setup (signaling) but the internal extension number is used for all billing calculations and report generation. For more on CDR data, see our <a href=\"https:\/\/multahost.com\/blog\/vos3000-cdr-analysis-billing\/\">VOS3000 CDR billing mode codes<\/a> guide. \ud83d\udcd6<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udccb-did-ddi-configuration-in-phone-management\">\ud83d\udccb VOS3000 DID DDI Numbers Configuration in Phone Management<\/h2>\n\n\n\n<p>\ud83d\udd11 The <strong>VOS3000 DID DDI numbers<\/strong> are configured in the Phone Management section of the VOS3000 client. Each phone can have one or more DID\/DDI numbers assigned, allowing a single extension to answer calls directed to multiple external numbers. \ud83d\udee0\ufe0f<\/p>\n\n\n\n<p>\ud83d\udccc According to the VOS3000 Phone Management documentation:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th class=\"has-text-align-left\" data-align=\"left\">Setting<\/th><th class=\"has-text-align-left\" data-align=\"left\">Location<\/th><th class=\"has-text-align-left\" data-align=\"left\">Description<\/th><\/tr><tr><td><strong>DID\/DDI<\/strong><\/td><td>Phone Management \u2192 Phone settings<\/td><td>After the phone on line, the other numbers allowed as caller ID or callee number<\/td><\/tr><tr><td>Phone number (primary)<\/td><td>Phone Management \u2192 Phone number field<\/td><td>The phone&#8217;s primary extension number \u2014 used for billing and reporting<\/td><\/tr><tr><td>Account ID<\/td><td>Phone Management \u2192 Account assignment<\/td><td>Account used for billing; rate applied regardless of which DID\/DDI number was dialed<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\ud83d\udca1 <strong>Configuration steps:<\/strong> (1) Log in to VOS3000 Client, (2) Navigate to Phone Management, (3) Select the phone extension, (4) In the DID\/DDI field, enter the external PSTN numbers that should be mapped to this phone, (5) Save and apply changes. The phone must be online for DID\/DDI to function \u2014 the manual specifies &#8220;after the phone on line.&#8221; For help with SIP trunk configuration for inbound DID, reach us on WhatsApp at <strong>+8801911119966<\/strong>. \ud83d\udcf1<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcca-vos-3000-did-ddi-use-case-scenarios\">\ud83d\udcca VOS3000 DID DDI Numbers \u2014 Use Case Scenarios<\/h2>\n\n\n\n<p>\ud83c\udfe2 Different VoIP deployment scenarios require different DID\/DDI configurations. Here are the most common deployment patterns: \ud83d\udca1<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th class=\"has-text-align-left\" data-align=\"left\">Use Case<\/th><th class=\"has-text-align-left\" data-align=\"left\">DID\/DDI Configuration<\/th><th class=\"has-text-align-left\" data-align=\"left\">Rationale<\/th><\/tr><tr><td>\ud83d\udcde Executive direct line<\/td><td>1 DID per phone (e.g., +1-555-0101 \u2192 ext 2001)<\/td><td>External callers dial the executive&#8217;s published number directly; one-to-one mapping<\/td><\/tr><tr><td>\ud83c\udfe2 Department shared number<\/td><td>1 DID mapped to multiple phones (via hunt group)<\/td><td>Department number rings all available staff; first to answer gets the call<\/td><\/tr><tr><td>\ud83c\udf10 Multi-city business<\/td><td>Multiple DID per phone (different area codes)<\/td><td>Single phone answers calls from local numbers in multiple cities; reduces long-distance charges for callers<\/td><\/tr><tr><td>\ud83c\udfe0 Work-from-home employee<\/td><td>1 DID (office number) \u2192 home extension<\/td><td>Customers dial the office number; call rings the employee&#8217;s home VoIP phone<\/td><\/tr><tr><td>\ud83d\udce1 Toll-free service<\/td><td>1-800 DID \u2192 service extension + reverse charging<\/td><td>Toll-free number routes to service extension; combine with reverse charging for caller-free billing<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\ud83c\udfaf <strong>Key consideration:<\/strong> The number of DID\/DDI numbers you can assign per phone depends on your VOS3000 configuration and SIP trunk capacity. Each DID requires a corresponding inbound route from your PSTN gateway or SIP trunk provider. For more on SIP trunk setup, see our <a href=\"https:\/\/multahost.com\/blog\/sip-trunking-with-vos3000-sip-trunking-bd-iptsp-india-pri-landline-twillo-vos3000-setup-sip-register-vos3000-gk-register-gw-vos3000\/\">VOS3000 SIP trunking guide<\/a>. \ud83d\udcd6<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udd17-did-ddi-and-caller-id-presentation\">\ud83d\udd17 DID\/DDI and Caller ID Presentation<\/h2>\n\n\n\n<p>\ud83d\udccb The <strong>VOS3000 DID DDI numbers<\/strong> serve a dual purpose: they accept inbound calls destined for the DID number, and they can also be used as the caller ID for outbound calls. According to the manual, DID\/DDI numbers are &#8220;allowed as caller ID or callee number&#8221; \u2014 meaning the phone can present the DID number when making outbound calls, and can receive calls when someone dials the DID number. \ud83d\udee0\ufe0f<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th class=\"has-text-align-left\" data-align=\"left\">Direction<\/th><th class=\"has-text-align-left\" data-align=\"left\">DID\/DDI Function<\/th><th class=\"has-text-align-left\" data-align=\"left\">Example<\/th><\/tr><tr><td><strong>Inbound call<\/strong><\/td><td>DID number used as callee number \u2014 external PSTN caller dials DID, call routes to phone extension<\/td><td>External caller dials +1-555-0199 \u2192 rings extension 2001<\/td><\/tr><tr><td><strong>Outbound call<\/strong><\/td><td>DID number used as caller ID \u2014 phone presents DID number to called party instead of internal extension<\/td><td>Extension 2001 calls out \u2192 called party sees +1-555-0199 on their display<\/td><\/tr><tr><td><strong>CDR billing<\/strong><\/td><td>Phone&#8217;s primary extension number used \u2014 DID number NOT recorded in billing data<\/td><td>CDR shows caller\/callee as 2001 (not +1-555-0199)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\ud83d\udccd This separation between signaling and billing is essential for proper CDR analysis and reporting. When you review call records, you will see the phone&#8217;s extension number, not the DID\/DDI number. This is by design \u2014 the DID\/DDI number is only a signaling alias. For more on CDR fields, see our <a href=\"https:\/\/multahost.com\/blog\/vos3000-cdr-analysis-billing\/\">VOS3000 CDR pipe format fields<\/a> reference. \ud83d\udcd6<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udee1\ufe0f-common-did-ddi-problems-and-solutions\">\ud83d\udee1\ufe0f Common DID\/DDI Problems and Solutions<\/h2>\n\n\n\n<p>\u26a0\ufe0f Misconfigured DID\/DDI settings can cause several issues. Here are the most common problems and their solutions:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u274c-problem-1-inbound-pstn-calls-not-reaching-phone-extension\">\u274c Problem 1: Inbound PSTN Calls Not Reaching Phone Extension<\/h3>\n\n\n\n<p>\ud83d\udd0d <strong>Symptom:<\/strong> External callers dial the DID number but receive a &#8220;number not in service&#8221; or the call does not ring the intended extension.<\/p>\n\n\n\n<p>\ud83d\udca1 <strong>Cause:<\/strong> The DID\/DDI number may not be properly configured on the phone, or the phone may be offline. The VOS3000 manual states that DID\/DDI functions &#8220;after the phone on line&#8221; \u2014 if the phone is not registered, the DID cannot route calls to it.<\/p>\n\n\n\n<p>\u2705 <strong>Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udccb Verify the DID\/DDI number is correctly entered in the phone&#8217;s settings<\/li>\n\n\n\n<li>\ud83d\udce1 Check that the phone is online and registered to the VOS3000 softswitch<\/li>\n\n\n\n<li>\ud83d\udd0d Verify the inbound route from the PSTN gateway correctly points to the DID number on VOS3000<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u274c-problem-2-did-number-appears-in-cdr-instead-of-extension-number\">\u274c Problem 2: DID Number Appears in CDR Instead of Extension Number<\/h3>\n\n\n\n<p>\ud83d\udd0d <strong>Symptom:<\/strong> The CDR shows the DID\/DDI number (e.g., +1-555-0199) instead of the phone&#8217;s extension number (e.g., 2001), contradicting the manual&#8217;s statement that DID is &#8220;not as billing and reporting datas.&#8221;<\/p>\n\n\n\n<p>\ud83d\udca1 <strong>Cause:<\/strong> In some VOS3000 configurations, the CDR format may include the DID number if certain system parameters are set to display the original called\/caller number. Check the CDR recording parameters.<\/p>\n\n\n\n<p>\u2705 <strong>Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udccb Review SS_CDRRECORDTOFILE and related CDR parameters<\/li>\n\n\n\n<li>\ud83d\udd0d Verify the phone&#8217;s primary number field contains the extension number, not the DID number<\/li>\n\n\n\n<li>\ud83d\udcca Ensure DID\/DDI numbers are entered only in the DID\/DDI field, not in the primary phone number field<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u274c-problem-3-wrong-caller-id-displayed-on-outbound-calls\">\u274c Problem 3: Wrong Caller ID Displayed on Outbound Calls<\/h3>\n\n\n\n<p>\ud83d\udd0d <strong>Symptom:<\/strong> When the phone makes an outbound call, the internal extension number (e.g., 2001) is displayed to the called party instead of the DID number (e.g., +1-555-0199).<\/p>\n\n\n\n<p>\ud83d\udca1 <strong>Cause:<\/strong> The DID\/DDI number may not be configured to serve as the outbound caller ID, or the phone&#8217;s display caller ID setting is overriding the DID number presentation.<\/p>\n\n\n\n<p>\u2705 <strong>Solutions:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udd10 Check the &#8220;Display caller id&#8221; supplementary service setting on the phone<\/li>\n\n\n\n<li>\ud83d\udccb Verify the DID\/DDI number is correctly configured as an allowed caller ID in the phone settings<\/li>\n\n\n\n<li>\ud83d\udd0d Check the mapping gateway or routing gateway outbound caller ID settings<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcca-vos-3000-did-ddi-configuration-checklist\">\ud83d\udcca VOS3000 DID\/DDI Configuration Checklist<\/h2>\n\n\n\n<p>\u2705 Use this checklist when deploying DID\/DDI numbers in your VOS3000 system:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th class=\"has-text-align-left\" data-align=\"left\">Check<\/th><th class=\"has-text-align-left\" data-align=\"left\">Action<\/th><th class=\"has-text-align-left\" data-align=\"left\">Status<\/th><\/tr><tr><td>\ud83d\udccc 1<\/td><td>Obtain DID\/DDI numbers from your SIP trunk or PSTN gateway provider<\/td><td>\u2610<\/td><\/tr><tr><td>\ud83d\udccc 2<\/td><td>Configure inbound routes on the PSTN gateway to forward DID calls to VOS3000<\/td><td>\u2610<\/td><\/tr><tr><td>\ud83d\udccc 3<\/td><td>Assign DID\/DDI numbers to the corresponding phone extensions in Phone Management<\/td><td>\u2610<\/td><\/tr><tr><td>\ud83d\udccc 4<\/td><td>Verify each phone is online and registered before testing DID routing<\/td><td>\u2610<\/td><\/tr><tr><td>\ud83d\udccc 5<\/td><td>Test inbound calls to each DID number and confirm correct extension rings<\/td><td>\u2610<\/td><\/tr><tr><td>\ud83d\udccc 6<\/td><td>Test outbound caller ID presentation to ensure DID number is displayed<\/td><td>\u2610<\/td><\/tr><tr><td>\ud83d\udccc 7<\/td><td>Verify CDR records use the phone&#8217;s extension number (not DID) for billing<\/td><td>\u2610<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\ud83d\udcde For expert guidance on VOS3000 DID\/DDI configuration and PSTN integration, reach us on WhatsApp at <strong>+8801911119966<\/strong>. \ud83d\udca1<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\u2753-frequently-asked-questions\">\u2753 Frequently Asked Questions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-what-are-vos-3000-did-ddi-numbers\">\u2753 What are VOS3000 DID DDI numbers?<\/h3>\n\n\n\n<p>\ud83d\udcde <strong>VOS3000 DID DDI numbers<\/strong> are external PSTN telephone numbers mapped to internal VoIP phone extensions. According to the VOS3000 V2.1.9.07 Manual (Section 2.5.2), DID\/DDI numbers are &#8220;the other numbers allowed as caller ID or callee number&#8221; after the phone comes online. DID (Direct Inward Dialing) and DDI (Direct Dialing Inward) are interchangeable terms that allow external callers to dial a specific internal extension directly. The manual also states these numbers are used &#8220;only as signaling transfer, not as billing and reporting datas.&#8221; \ud83d\udccb<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-what-is-the-difference-between-did-and-ddi\">\u2753 What is the difference between DID and DDI?<\/h3>\n\n\n\n<p>\ud83d\udd04 DID (Direct Inward Dialing) and DDI (Direct Dialing Inward) refer to the same concept \u2014 the terms are used interchangeably in the telecommunications industry. DID is the more common term in North America, while DDI is more frequently used in Europe and the UK. In VOS3000, the setting is labeled &#8220;DID\/DDI&#8221; to accommodate both naming conventions. Both describe the ability for external callers to dial an internal extension directly without going through an operator. \ud83d\udd27<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-can-i-assign-multiple-did-ddi-numbers-to-a-single-phone\">\u2753 Can I assign multiple DID\/DDI numbers to a single phone?<\/h3>\n\n\n\n<p>\ud83d\udcde Yes. The VOS3000 manual describes DID\/DDI as &#8220;the other numbers&#8221; (plural) &#8220;allowed as caller ID or callee number.&#8221; This indicates that a single phone can have multiple DID\/DDI numbers assigned. For example, a phone could have DID numbers for different area codes (+1-555-0199 for New York, +1-310-0199 for Los Angeles) so that callers from different cities can reach the same extension by dialing a local number. Each DID number is added to the phone&#8217;s DID\/DDI configuration field. \ud83d\udca1<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-do-did-ddi-numbers-appear-in-billing-records\">\u2753 Do DID\/DDI numbers appear in billing records?<\/h3>\n\n\n\n<p>\ud83d\udcca No. The VOS3000 manual explicitly states that DID\/DDI numbers are used &#8220;only as signaling transfer, not as billing and reporting datas.&#8221; This means the phone&#8217;s primary extension number is what appears in CDR records, billing reports, and usage analysis \u2014 not the DID\/DDI number. The DID\/DDI number is used for call setup and routing in the SIP signaling layer, but for all billing and reporting purposes, the phone&#8217;s extension number is the authoritative identifier. \ud83d\udccb<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-does-the-phone-need-to-be-online-for-did-ddi-to-work\">\u2753 Does the phone need to be online for DID\/DDI to work?<\/h3>\n\n\n\n<p>\ud83d\udce1 Yes. The VOS3000 manual specifies that DID\/DDI functions &#8220;after the phone on line.&#8221; This means the phone must be registered and online with the VOS3000 softswitch before it can receive calls directed to its DID\/DDI numbers. If the phone is offline or unregistered, inbound calls to its DID numbers will fail \u2014 they may be routed to voicemail, a busy signal, or an error response depending on the <a href=\"https:\/\/multahost.com\/blog\/vos3000-call-routing\/\">call forwarding<\/a> configuration. \ud83d\udcde<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u2753-how-do-did-ddi-numbers-differ-from-the-phones-primary-extension-number\">\u2753 How do DID\/DDI numbers differ from the phone&#8217;s primary extension number?<\/h3>\n\n\n\n<p>\ud83d\udd11 The phone&#8217;s primary extension number (e.g., 2001) is the internal identifier used for all billing, reporting, and account management. It is the number that appears in CDRs and billing calculations. DID\/DDI numbers (e.g., +1-555-0199) are external PSTN numbers mapped to the phone for signaling purposes \u2014 they allow external callers to reach the extension and can be presented as the outbound caller ID. Think of the extension number as the phone&#8217;s &#8220;real&#8221; identity within VOS3000, and DID\/DDI numbers as aliases that bridge the external PSTN world to the internal VoIP system. For more on phone identity, see our <a href=\"https:\/\/multahost.com\/blog\/vos3000-caller-id-management-complete\/\">display caller ID forwarding<\/a> guide. \ud83d\udca1<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\ud83d\udcde-need-call-center-setup-support\">\ud83d\udcde Need Professional VOS3000 Setup Support?<\/h2>\n\n\n\n<p>For professional VOS3000 installations and deployment, VOS3000 Server Rental Solution:<\/p>\n\n\n\n<p>\ud83d\udcf1 <strong>WhatsApp:<\/strong> <a href=\"https:\/\/wa.me\/8801911119966\" target=\"_blank\" rel=\"noopener\">+8801911119966<\/a><br>\ud83c\udf10 <strong>Website:<\/strong> <a href=\"https:\/\/www.vos3000.com\" target=\"_blank\" rel=\"noopener\">www.vos3000.com<\/a><br>\ud83c\udf10 <strong>Blog:<\/strong> <a href=\"https:\/\/multahost.com\/blog\">multahost.com\/blog<\/a><br>\ud83d\udce5 <strong>Downloads:<\/strong> <a href=\"https:\/\/www.vos3000.com\/downloads.php\" target=\"_blank\" rel=\"noopener\">VOS3000 Downloads<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><img data-recalc-dims=\"1\" height=\"809\" width=\"809\" decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" alt=\"VOS3000 Authorization Type Hierarchy, VOS3000 Reverse Charging, VOS3000 DID DDI Numbers, VOS3000 Call Forwarding Types, VOS3000 Do Not Disturb Mode, VOS3000 Display Caller ID Forwarding, VOS3000 Monthly Consumption Limits, VOS3000 IVR Callback Timing, VOS3000 IVR Call State UDP Reporting, VOS3000 IVR Codec Priority, VOS3000 IVR Voicemail Navigation, VOS3000 IVR Custom Ringback Tone, VOS3000 IVR DTMF Parse Mode, VOS3000 IVR Voicemail System, VOS3000 authorization type hierarchy, VOS3000 reverse charging configuration, VOS3000 DID DDI numbers, VOS3000 call forwarding types, VOS3000 do not disturb mode, VOS3000 display caller ID forwarding, VOS3000 monthly consumption limits, VOS3000 IVR callback timing, VOS3000 IVR call state UDP, VOS3000 IVR codec priority, VOS3000 IVR inband DTMF detection, VOS3000 IVR DTMF parse mode, VOS3000 IVR voicemail system, VOS3000 IVR voice alarm configuration, VOS3000 IVR custom ringback tone, VOS3000 IVR voicemail navigation\" title=\"\" class=\"lazyload\" data-src=\"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-IVR-Codec-Priority-VOS3000-IVR-Voicemail-Navigation-VOS3000-IVR-Custom-Ringback-Tone-VOS3000-IVR-DTMF-Parse-Mode-VOS3000-IVR-Voicemail-System-2.png?resize=809%2C809\"><\/td><td><img data-recalc-dims=\"1\" height=\"809\" width=\"809\" decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" alt=\"VOS3000 Authorization Type Hierarchy, VOS3000 Reverse Charging, VOS3000 DID DDI Numbers, VOS3000 Call Forwarding Types, VOS3000 Do Not Disturb Mode, VOS3000 Display Caller ID Forwarding, VOS3000 Monthly Consumption Limits, VOS3000 IVR Callback Timing, VOS3000 IVR Call State UDP Reporting, VOS3000 IVR Codec Priority, VOS3000 IVR Voicemail Navigation, VOS3000 IVR Custom Ringback Tone, VOS3000 IVR DTMF Parse Mode, VOS3000 IVR Voicemail System, VOS3000 authorization type hierarchy, VOS3000 reverse charging configuration, VOS3000 DID DDI numbers, VOS3000 call forwarding types, VOS3000 do not disturb mode, VOS3000 display caller ID forwarding, VOS3000 monthly consumption limits, VOS3000 IVR callback timing, VOS3000 IVR call state UDP, VOS3000 IVR codec priority, VOS3000 IVR inband DTMF detection, VOS3000 IVR DTMF parse mode, VOS3000 IVR voicemail system, VOS3000 IVR voice alarm configuration, VOS3000 IVR custom ringback tone, VOS3000 IVR voicemail navigation\" title=\"\" class=\"lazyload\" data-src=\"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-IVR-Codec-Priority-VOS3000-IVR-Voicemail-Navigation-VOS3000-IVR-Custom-Ringback-Tone-VOS3000-IVR-DTMF-Parse-Mode-VOS3000-IVR-Voicemail-System-2.png?resize=809%2C809\"><\/td><td><img data-recalc-dims=\"1\" height=\"809\" width=\"809\" decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" alt=\"VOS3000 Authorization Type Hierarchy, VOS3000 Reverse Charging, VOS3000 DID DDI Numbers, VOS3000 Call Forwarding Types, VOS3000 Do Not Disturb Mode, VOS3000 Display Caller ID Forwarding, VOS3000 Monthly Consumption Limits, VOS3000 IVR Callback Timing, VOS3000 IVR Call State UDP Reporting, VOS3000 IVR Codec Priority, VOS3000 IVR Voicemail Navigation, VOS3000 IVR Custom Ringback Tone, VOS3000 IVR DTMF Parse Mode, VOS3000 IVR Voicemail System, VOS3000 authorization type hierarchy, VOS3000 reverse charging configuration, VOS3000 DID DDI numbers, VOS3000 call forwarding types, VOS3000 do not disturb mode, VOS3000 display caller ID forwarding, VOS3000 monthly consumption limits, VOS3000 IVR callback timing, VOS3000 IVR call state UDP, VOS3000 IVR codec priority, VOS3000 IVR inband DTMF detection, VOS3000 IVR DTMF parse mode, VOS3000 IVR voicemail system, VOS3000 IVR voice alarm configuration, VOS3000 IVR custom ringback tone, VOS3000 IVR voicemail navigation\" title=\"\" class=\"lazyload\" data-src=\"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-IVR-Codec-Priority-VOS3000-IVR-Voicemail-Navigation-VOS3000-IVR-Custom-Ringback-Tone-VOS3000-IVR-DTMF-Parse-Mode-VOS3000-IVR-Voicemail-System-2.png?resize=809%2C809\"><\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Master VOS3000 DID DDI numbers: map external PSTN numbers to internal extensions. Configure Direct Inward Dialing assignment, multiple DID per phone, and incoming call routing per extension. <\/p>\n","protected":false},"author":1,"featured_media":3453,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[2],"tags":[11353,11384,11356,11397,11398,11392,11363,11362,11352,11395,11351,11371,11388,11369,11391,11386,11376,11393,11385,11368,11382,11365,11375,11380,11387,11355,11360,11366,11390,11379,11383,11378,11364,11389,11367,11396,11370,11381,11373,11394,11372,11354,11358,11361,11377,11357,11359,11374],"class_list":["post-3469","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vos3000","tag-vos3000-ddi-configuration","tag-vos3000-ddi-phone-extension","tag-vos3000-did-assignment","tag-vos3000-did-best-practices","tag-vos3000-did-billing-reporting","tag-vos3000-did-call-routing","tag-vos3000-did-callee-number","tag-vos3000-did-caller-id","tag-vos3000-did-configuration","tag-vos3000-did-configuration-steps","tag-vos3000-did-ddi-numbers","tag-vos3000-did-did-difference","tag-vos3000-did-e164-number","tag-vos3000-did-extension-mapping","tag-vos3000-did-extension-number","tag-vos3000-did-external-caller-id","tag-vos3000-did-external-internal-mapping","tag-vos3000-did-inbound-call","tag-vos3000-did-inbound-routing","tag-vos3000-did-incoming-call-routing","tag-vos3000-did-manual-reference","tag-vos3000-did-not-billing-data","tag-vos3000-did-number-assignment","tag-vos3000-did-number-configuration","tag-vos3000-did-number-format","tag-vos3000-did-number-mapping","tag-vos3000-did-per-phone","tag-vos3000-did-phone-management","tag-vos3000-did-phone-number","tag-vos3000-did-phone-online","tag-vos3000-did-setup-guide","tag-vos3000-did-signaling-only","tag-vos3000-did-signaling-transfer","tag-vos3000-did-sip-trunk","tag-vos3000-did-supplementary-service","tag-vos3000-did-troubleshooting","tag-vos3000-did-trunk-number","tag-vos3000-did-v2-1-9-07","tag-vos3000-did-voip-configuration","tag-vos3000-did-voip-softswitch","tag-vos3000-direct-dialing-inward","tag-vos3000-direct-inward-dialing","tag-vos3000-external-number-mapping","tag-vos3000-multiple-did-numbers","tag-vos3000-phone-did-settings","tag-vos3000-phone-did-setup","tag-vos3000-pstn-did-number","tag-vos3000-softswitch-did"],"acf":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/04\/VOS3000-IVR-Call-State-UDP-Reporting-VOS3000-IVR-Codec-Priority-VOS3000-IVR-Voicemail-Navigation-VOS3000-IVR-Custom-Ringback-Tone.png?fit=1536%2C1024&ssl=1?v=1777502914","jetpack-related-posts":[{"id":1809,"url":"https:\/\/multahost.com\/blog\/vos3000-vicidial-auto-dialer\/","url_meta":{"origin":3469,"position":0},"title":"VOS3000 VICIdial Auto Dialer Solution \u2013 Call Center Important Setup Guide","author":"king","date":"March 13, 2026","format":false,"excerpt":"Complete guide to VOS3000 VICIdial auto dialer solution for call centers. Learn how VICIdial connects with VOS3000 for routing and telecom carrier management.","rel":"","context":"In &quot;VOS3000&quot;","block_context":{"text":"VOS3000","link":"https:\/\/multahost.com\/blog\/category\/vos3000\/"},"img":{"alt_text":"best voip softswitch, vos3000 routing, vos3000 vicidial auto dialer, vos3000 sip trunk configuration","src":"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/03\/best-voip-softswitch.png?fit=1200%2C800&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/03\/best-voip-softswitch.png?fit=1200%2C800&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/03\/best-voip-softswitch.png?fit=1200%2C800&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/03\/best-voip-softswitch.png?fit=1200%2C800&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/multahost.com\/blog\/wp-content\/uploads\/2026\/03\/best-voip-softswitch.png?fit=1200%2C800&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":3404,"url":"https:\/\/multahost.com\/blog\/vos3000-no-answer-auto-blacklist\/","url_meta":{"origin":3469,"position":1},"title":"VOS3000 No-Answer Auto-Blacklist: Proven SS_BLACK_LIST_NO_ANSWER Configuration","author":"king","date":"April 28, 2026","format":false,"excerpt":"Configure VOS3000 no-answer auto-blacklist with SS_BLACK_LIST_NO_ANSWER. 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